Fastest PDF reader?

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Looking for a PDF document reader. It has to be fast: It opens fast. It scrolls fast. It turns pages fast. It refreshes fast.
Also, it should strictly be a reader. I don't want to edit PDF documents. I don't want to watch multimedia in PDF. In fact, I don't want it to have any editing or multimedia functions, which only make the app slow and bloated with features/UI icons that I don't need or use.
Again, it has to be lightning fast. I store professional references and resources on my mobile SD card, and I often check them for information. That's why I need the app to be fast. When
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